Stock-Based Compensation (Tables)

9 Months Ended

Sep. 30, 2020

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Share-based Payment Arrangement, Cost by Plan [Table Text Block]

The following table summarizes OG&E's pre-tax compensation expense and related income tax benefit during the three and nine months ended September 30, 2020 and 2019 related to OGE Energy's performance units and restricted stock units for OG&E employees.

	Three Months Ended September 30,				Nine Months Ended September 30,
(In millions)	2020		2019		2020		2019
Performance units:
Total shareholder return	$	0.5	$	0.8	$	1.8	$	2.3
Earnings per share	—		0.8		0.1		1.1
Total performance units	0.5		1.6		1.9		3.4
Restricted stock units	0.1		0.1		0.3		0.3
Total compensation expense	$	0.6	$	1.7	$	2.2	$	3.7
Income tax benefit	$	0.2	$	0.4	$	0.6	$	0.9